Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 11, Pages 9407-9414Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b18875
Keywords
nickel hydroxylphosphate/iron hydroxide; single-wall nanotubes; synergistic effect; controllable synthesis; oxygen evolution reaction
Funding
- NSFC [21431003, 21521091]
- China Ministry of Science and Technology [2016YEA0202801]
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Development of efficient electrocatalysts for oxygen evolution reaction (OER) is of great significance for future renewable energy applications. Herein, efficient OER electrocatalysts based on iron hydroxide-modified nickel hydroxylphosphate (NiPO/Fe(OH)(x)) single-wall nanotubes (SWNTs) have been prepared by a facile stepwise surfactant-free solvothermal strategy, which possess diameters of about 6 nm and lengths of about several micrometers. Benefiting from the synergistic effect between iron hydroxides and NiPO SWNTs, the as-prepared NiPO/Fe(OH)(x) SWNTs exhibit higher OER activity than primary NiPO SWNTs. Furthermore, the OER activity with different Fe contents displays a volcano-type shape, and the optimized NiPO/Fe(OH) SWNTs present excellent activity with a low overpotential of 248 mV to deliver a current density of 10 mA cm(-2) and 323 mV to achieve a large current density of 100 mA cm(-2), as well as a remarkably low Tafel slope of 45.4 mV dec(-1) in 1 M KOH electrolyte. The present work provides valuable insights to improve the OER performance by rational surface modification.
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